A library binding various POSIX APIs. POSIX is the IEEE Portable
Operating System Interface standard. luaposix is based on lposix.

This require one version of Lua installed (lua, lua52, lua53, luajit):
Default support for all versions of Lua installed before build.
To specify which Lua versions:
  LUAVER="vers"

"vers" must be one or more of "5.1 5.2 5.3 jit", in the right order,
separated with space
